新建桥梁如采用混凝土分片梁，轨底至梁顶高度为（）。A、400mm B、420mm C

根据上下文填入一个合适的词，使对话完整.

A: Hello, Jim.

B: Hello, Li Lei. Who are __1__?

A: Sorry. __2__ is Li Qiao, and __3__ is Wu Hao. Li Qiao and   _4_  , this is my American _5__ Jim.

C: How do you do, Jim?

D: How do you do, Jim?

B: How do you do? __6__ to meet you. Li Qiao and Wu Hao. Are you in _7__ Two, Grade Seven?

C and D: You are __8__. We’re in the same class __9__ Li Lei.

B: Oh, good. Let’s be friends __10__.

—What _____ did you do?

—I hung out with my friend and took some photos.